<PRE><B>Question 958743</B>
You can think of this as 1 plane flying 
at the sum of their speeds and the other
plane not moving. Then imagine that
the moving plane stops {{{ 12 }}} miles
short of destination
----------------------
{{{ 1300 - 12 = ( 450 + 490 )*t }}}
{{{ 1288 = 940t }}}
{{{ t = 1.3702 }}}|
{{{ .3702*60 = 22.2128 }}}
{{{ .2128*60 = 12.766 }}}
The planes will be 12 mi apart in
1 hr 22 min 13 sec
---------------------
check:
{{{ 1300 - 12 = ( 450 + 490 )*1.3702 }}}
{{{ 1288 = 940*1.3702 }}}
{{{ 1288 = 1287.988 }}}
close enough

</PRE>